，也是经过强化训练，在大宅众人经常都挖得手起水泡。三人一个小组，数不到十下，就可以挖到一个不小的陷井坑。挖陷井的地点选择，也经过训练，坡高坡低，走哪里才顺骑路，这经常做为考核。
一下子功夫，几十个人就在山坡上挖下几百个陷井坑，而且布局有规律，这都是事先预演过的。
火油，每个人身上都会带着一壶，打家劫舍杀人放火的必备之物，几十个人寻来大量柴火干草布置火沟。
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