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[testcase]

I've never bent rebar myself so, I can't report on the effort required. I've seen lots of rebar used as tent stakes though so, I know its commonly done. A sturdy vise and proper application of leverage should get the job done. I think a regular hammer would drive rebar into the ground. The "L" gives you a surface on which to facilitate removal. I would recommend that on whatever stakes you use, you cover the expose ends to warn passers by and avoid injuries from careless people walking into them, especially in the dark.