Short answers, pulled from the story.
The Suiyuan campaign was a 1936 attempt by the Inner Mongolian Army and the Grand Han Righteous Army, both founded and supported by the Empire of Japan, to take Suiyuan province from the Republic of China. It happened shortly before the Second Sino-Japanese War and ended in defeat for the Japanese-backed forces.
The invasion began in October 1936, with the heaviest fighting occurring in November 1936 at Hongort and Bailingmiao. Small-scale fighting continued in Suiyuan for months afterward, lasting until the Marco Polo Bridge Incident in July 1937.
Prince Demchugdongrub, known as De Wang, commanded the roughly 10,000-strong Inner Mongolian Army. Wang Ying led the Grand Han Righteous Army of about 6,000 men, while Li Shouxin commanded a better-armed and better-trained detachment held in reserve.
The Suiyuan campaign failed mainly because of poor training and low morale among the Mongolian and collaborationist troops. General Fu Zuoyi's Chinese 35th Army exploited this weakness, routing the invaders at Bailingmiao on the 17th of November 1936.
Fu Zuoyi's 35th Army flanked the Mongolian headquarters at Bailingmiao, broke through the gates with trucks after suicide attacks, and drove out the Inner Mongolian 7th Cavalry Division. The Mongols lost three hundred to nine hundred men killed, three hundred wounded, and three hundred captured, along with trucks, artillery, and other supplies.
No. Japan's foreign minister, Hachiro Arita, said 'Japan was not involved in this conflict in Suiyuan at all.' Chinese forces pointed to captured Japanese trucks, artillery, and other equipment as evidence contradicting that denial.