Thursday, March 19, 2020

Battle of Isandlwana - Anglo-Zulu War

Battle of Isandlwana - Anglo-Zulu War Battle of Isandlwana - Conflict The Battle of Isandlwana was part of the 1879 Anglo-Zulu War in South Africa. Date The British were defeated on January 22, 1879. Armies Commanders British Lieutenant Colonel Henry PulleineLieutenant Colonel Anthony William Durnford1,400 British, 2,500 African infantry Zulu Ntshingwayo kaMAholeMavumengwana kaMdlela Ntuliapprox. 12,000 infantry Background In December 1878, following the death of several British citizens at the hands of the Zulus, authorities in the South African province of Natal issued an ultimatum to the Zulu king Cetshwayo demanding that the perpetrators be turned over for trial. This request was refused and the British began preparations to cross the Tugela River and invade Zululand. Led by Lord Chelmsford, British forces advanced in three columns with one moving along the coast, another from the north and west, and the Centre Column advancing through Rourkes Drift towards Cetshwayos base at Ulundi. To counter this invasion, Cetshwayo mustered a massive army of 24,000 warriors. Armed with spears and old muskets, the army was divided in two with one section sent to intercept the British on the coast and the other to defeat the Centre Column. Moving slowly, Centre Column reached Isandlwana Hill on January 20, 1879. Making camp in the shadow of the rocky promontory, Chelmsford sent out patrols to locate the Zulus. The following day, a mounted force under Major Charles Dartnell encountered a strong Zulu force. Fighting through the night, Dartnell was not able to break off contact until early on the 22nd. The British Move After hearing from Dartnell, Chelmsford resolved to move against the Zulus in force. At dawn, Chelmsford led 2,500 men and 4 guns out from Isandlwana to track down the Zulu army. Though badly outnumbered, he was confident that British firepower would adequately compensate for his lack of men. To guard the camp at Isandlwana, Chelmsford left 1,300 men, centered on the 1st Battalion of the 24th Foot, under Brevet Lieutenant Colonel Henry Pulleine. In addition, he ordered Lieutenant Colonel Anthony Durnford, with his five troops of native cavalry and a rocket battery, to join Pulleine. On the morning of the 22nd, Chelmsford began vainly searching for the Zulus, unaware that they had slipped around his force and were moving on Isandlwana. Around 10:00 Durnford and his men arrived at the camp. After receiving reports of Zulus to the east, he departed with his command to investigate. At approximately 11:00, a patrol led by Lieutenant Charles Raw discovered the main body of the Zulu army in a small valley. Spotted by the Zulus, Raws men began a fighting retreat back to Isandlwana. Warned of the Zulus approach by Durnford, Pulleine began forming his men for battle. The British Destroyed An administrator, Pulleine had little experience in the field and rather than ordering his men to form a tight defensive perimeter with Isandlwana protecting their rear he ordered them into a standard firing line. Returning to the camp, Durnfords men took a position on the right of the British line. As they approached the British, the Zulu attack formed into the traditional horns and chest of the buffalo. This formation allowed the chest to hold the enemy while the horns worked around the flanks. As the battle opened, Pulleines men were able to beat off the Zulu attack with disciplined rifle fire. On the right, Durnfords men began to run low on ammunition and withdrew to the camp leaving the British flank vulnerable. This coupled with orders from Pulleine to fall back towards the camp led to a collapse of the British line. Attacking from the flanks the Zulus were able to get between the British and the campsite. Overrun, British resistance was reduced to a series of desperate last stands as the 1st Battalion and Durnfords command were effectively wiped out. Aftermath The Battle of Isandlwana proved to be the worst defeat ever suffered by British forces against native opposition. All told, the battle cost the British 858 killed as well as 471 of their African troops for a total of 1,329 dead. Casualties among the African forces tended to be lower as they filtered away from the battle during its early stages. Only 55 British soldiers managed to escape the battlefield. On the Zulu side, casualties were approximately 3,000 killed and 3,000 wounded. Returning to Isandlwana that night, Chelmsford was stunned to find a bloody battlefield. In the wake of the defeat and the heroic defense of Rourkes Drift, Chelmsford set about regrouping British forces in the region. With the full support of London, which wished to see the defeat avenged, Chelmsford went on to defeat the Zulus at the Battle of Ulundi on July 4 and capture Cetshwayo on August 28. Selected Sources British Battles: Battle of IsandlwanaIsandlwana Campaign

Monday, March 2, 2020

Facts About Soft Coral (Octocorals)

Facts About Soft Coral (Octocorals) Soft corals refer to the organisms in the class Octocorallia, which includes gorgonians, sea fans, sea pens, sea feathers, and blue corals. These corals have a flexible, sometimes leathery, appearance. Although many resemble plants, they are actually animals. Soft corals are colonial organisms, which means they are formed of colonies of polyps. The polyps of soft corals have eight feathery tentacles, which is why they are also known as octocorals. One way to tell the difference between soft corals and hard (stony) corals is that the polyps of hard corals have six tentacles, which are not feathery. Here are some stony coral characteristics, with some of the key differences with soft corals identified: They have polyps that secrete a cup (calyx or calice) in which they live. The polyps of soft corals usually have feathery tentacles.They may harbor zooxanthellae, algae that live within coral polyps and can produce brilliant colors. Others may be colored by bright pink, blue or purple pigmentation.They may contain spikes called sclerites, which are made of calcium carbonate and protein, and are located within a jelly-like tissue called coenenchyme. This tissue lies between the polyps and contains canals called solenia, which transport fluids between the polyps. In addition to providing structure to the coral and protection from predators, the shape and orientation of the sclerites can be used to identify coral species.They have an inner core made out of a protein called gorgonin.They may have a variety of shapes, including fan-like, whip-like or feather-like, or even leathery or encrusting. Classification Kingdom: AnimaliaPhylum: CnidariaClass: AnthozoaSubclass: OctocoralliaOrders:Alcyonacea (the horny corals, also known as the gorgonians, sea fans and sea feathers)Helioporacea (blue corals)Pennatulacea (sea pens) Habitat and Distribution Soft corals are found worldwide, primarily in tropical or subtropical waters. Soft corals do not produce reefs but may live on them. They may also be found in the deep sea. Feeding and Diet Soft corals may feed during the night or day. They use their nematocysts (stinging cells) to sting passing plankton or other small organisms, which they pass to their mouth. Reproduction Soft corals can reproduce both sexually and asexually. Asexual reproduction occurs by budding when a new polyp grows out of an existing polyp. Sexual reproduction occurs either when sperm and eggs are released in a mass spawning event, or by brooding, when only sperm are released, and these are captured by female polyps with eggs. Once the egg is fertilized, a larva is produced and eventually settles to the bottom. Conservation and Human Uses Soft corals may be harvested for use in aquariums. Wild soft corals may also attract tourism in the form of dive and snorkeling operations. Compounds within the tissues of soft corals may be used for medicines. Threats include human disturbance (through humans stepping on corals or dropping anchors on them), overharvesting, pollution, and habitat destruction. Examples of Soft Corals Soft coral species include: Dead Mans Fingers (Alcyonium digitatum)Sea FansSea Pens Sources and Further Reading GBR Explorer. Soft Corals. ReefED.NOAA. Coral Anatomy and Structure. NOAA Coral Reef Conservation Program.Simpson, A. 2009. Reproduction in Octocorals (Subclass Octocorallia): A Review of Published Literature. Version 16 July 2009. In Deep-Sea Corals Portal.South Carolina Department of Natural Resources. Octocoral Morphology.Tan, Ria. 2008. Soft Corals. Wild Fact Sheets.Wet Web Media. The Soft Corals, Order Alcyonacea; Use In Marine Aquariums.