In November 1914, British Indian Expeditionary Force "B" conducted an amphibious assault on the Port of Tanga in German East Africa. The British possessed all the tools required for success; they outnumbered the defenders almost eight to one, they possessed the only artillery and naval guns available for the battle, and they landed where the Germans were weak. Despite these factors, a hastily organized German defense force of 1,100 soldiers not only defeated the 8,000 British soldiers, but also compelled Indian Expeditionary Force "B" to retreat to Mombasa. This thesis examines the manner in which German and British forces were organized, trained, equipped, and led. Additionally, it identifies the critical factors that together led to British defeat at Tanga.