using whatevertools came to hand in the “great game ” of espionage什么意思

后边一句是说的是：在间谍活动这个伟大的游戏中。难点主要是这句哈~Donovan believed in using whatever tools came to hand 。首先是Donovan believed in using后面跟了一个由whatever引导的宾语从句：Donovan相信(可以)使用tools (that) came to hand. 到手的工具所以整句话