兵来将迎，水来土堰

Explanation: Means under specific circumstances, adopt a flexible approach to deal with. 　　Source: Yuan High Wenxiu "Mianchi will" wedge: "Since ancient times, the road to greet soldiers, soil water weir, if he led troops to come, I lead the troops with his battle here." Thesaurus:  Soldiers to be blocked, troubled water, Soldiers to the enemy, Water earth bank, Soldiers to the enemy, soil water weir