Shortly afterward, advance units of the 5th Division departed for China, bringing Japanese strength to 3,800 personnel out of the 17,000 of allied forces. The commander of the 5th Division, Lt. General Yamaguchi Motoomi, had taken operational control from Fukushima. Japanese troops were involved in the storming of Tianjin on July 14, after which the allies consolidated and awaited the remainder of the 5th Division and other coalition reinforcements. By the time the siege of legations was lifted on August 14, 1900, the Japanese force of 13,000 was the largest single contingent and made up about 40% of the approximately 33,000 strong allied expeditionary force. Japanese troops involved in the fighting had acquitted themselves well, although a British military observer felt their aggressiveness, densely-packed formations, and over-willingness to attack cost them excessive and disproportionate casualties. For example, during the Tianjin fighting, the Japanese suffered more than half of the allied casualties (400 out of 730) but comprised less than one quarter (3,800) of the force of 17,000. Similarly at Beijing, the Japanese accounted for almost two-thirds of the losses (280 of 453) even though they constituted slightly less than half of the assault force.