Shortly afterward, advance units of the 5th Division departed for China, bringing Japanese strength to 3,800 personnel, of the then-17,000 allied force. The commander of the 5th Division, Lt. General Yamaguchi Motoomi, had taken operational control from Fukushima. A second, stronger allied expeditionary army stormed Tianjin, on July 14, and occupied the city. The allies then consolidated and awaited the remainder of the 5th Division and other coalition reinforcements. In early August, the expedition pushed towards the capital where on August 14, it lifted the Boxer siege. By that time, the 13,000-strong Japanese force was the largest single contingent, making up about 40 percent 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 casualties. For example, during the Tianjin fighting, the Japanese, while comprising less than one quarter (3,800) of the total allied force of 17,000, suffered more than half of the casualties, 400 out of 730. Similarly at Beijing, the Japanese, constituting slightly less than half of the assault force, accounted for almost two-thirds of the losses, 280 of 453.