1. It belongs to the subtropical monsoon climate, with the prevailing northwesterly winds in winter, and it is not possible to have southeasterly winds.

2. Chibi section of the Yangtze River channel nine curves and eighteen bends, Sun and Liu allied forces are likely to change through the alignment of the upstream and downstream along the river, with a variety of ways to occupy the northwesterly winds of the upwind direction, the formation of the windward trend to complete the fire attack.