Why attack toward Chongqing without roads?

Why did the Imperial Japanese Army attempt an advance toward Chongqing despite central China's poor transport infrastructure?

Commanders believed infantry determination could overcome conditions that made reliable food and ammunition supply impossible.

Commanders believed their infantry could reach Chongqing despite central China's poor roads. That confidence treated logistics as something that would somehow follow the advance. Determination and honour could keep troops marching, but they could not deliver the food and ammunition needed when the troops arrived. The comparison with Wellington's coastal supply in the Peninsular War shows the advantage of planning an advance around a dependable transport system.