Meaning of "仕掛ける機会"


I was reading something and I came across this sentence:

> それだって **仕掛ける機会** が得られなかったというだけで、殺しそのものを失敗したわけでも証拠を残したわけでもない。

My problem is that I don’t understand what **仕掛ける機会** means in this context. I
know that **機会** is something like chance or opportunity, but the verb doesn't
make sense to me. Sorry if I can't ask this here.




仕掛ける means ''challenge'' or ''set traps'', but it's hard to tell which is
correct from only this sentence. It's depends on what ''それ(=it)''in sentence
is talking about.




仕掛ける means ''challenge'' or ''set traps'', but it's hard to tell which is
correct from only this sentence. It's depends on what ''それ(=it)''in sentence
is talking about.

