This is the explanation of what Chiang Kai-shek calls “magnetic warfare.” Whenever the Japanese attempt a major thrust the Chinese retreat, without losing contact, until they have drawn the Japanese column far from its starting point. By scattering their defense, the Chinese force the Japanese to weaken their main column by detaching units from it. As the Chinese are very weak in artillery, the ideal moment for them to strike is when they have drawn the Japanese into country where their artillery cannot maneuver advantageously. The Chinese then bring their trench mortars into action; with these and with machine guns and rifles and finally with hand grenades and bayonets, they close in on the Japanese, preventing reinforcement from the rear and at the same time destroying the head of the column. It was in this way that the Chinese won the battles of Changsha in 1941 and 1942 and the Ichang campaign of 1943.