With the nation fully committed to the war, the Emperor took a keen interest in military progress and sought to boost morale. According to Akira Yamada and Akira Fujiwara, the Emperor made major interventions in some military operations. For example, he pressed Sugiyama four times, on 13 and 21 January and 9 and 26 February, to increase troop strength and launch an attack on Bataan. On 9 February 19 March, and 29 May, the Emperor ordered the Army Chief of staff to examine the possibilities for an attack on Chungking in China, which led to Operation Gogo.