Why did japan enter the war and what did they have to gain?
On August 15, 1914, Japan issued an ultimatum to Germany. They demanded the evacuation of Tsing-tau, the disarming of the warships there and the handing over of the territory to Japan for ultimate reversion to China. The time limit for the reply was set at 12 o'clock, August 24th. To this ultimatum Germany made no reply, and at 2:30 P. M., August 23rd, the German Ambassador was handed his passports and war was declared. The country was bound by treaty to Great Britain to come to their aid in any war in which Great Britain might be involved. On August 4th, a note was received from Great Britain requesting Japan to safeguard British shipping in the Far East. Japan replied that they could not guarantee the safety of British shipping so long as Germany was in occupation of the Chinese province of Tsing-tau. They suggested in turn that England agree to allow her to re-move this German menace. The British Government agreed, on the condition that Tsing-tau be subsequently returned to China. If Japan entered the war, Politically, Japan would have the opportunity to expand its sphere of influence in China and to gain recognition as a great power in post-war geopolitics.
The Gallipoli Campaign or battle of Gallipoli
The Gallipoli Campaign of 1915-16, also known as the Battle of Gallipoli was an unsuccessful attempt by the Allied Powers to control the sea route from Europe to Russia during World War I. The campaign began with a failed naval attack by British and French ships on the Dardanelles Straits in February-March 1915 and continued with a major land invasion of the Gallipoli Peninsula on April 25, involving British and French troops as well as divisions of the Australian and New Zealand Army Corps. Lack of sufficient intelligence and knowledge of the terrain, along with a fierce Turkish resistance, hampered the success of the invasion. By mid-October, Allied forces had suffered heavy casualties and had made little headway from their initial landing sites. Evacuation began in December 1915, and was completed early the following January.