One way of making a drop fence that's fairly common is to use wood posts. Put in 2 extra long staples about 1" apart, 1 above the other. Pound them in about 1/2 way. The wire is held against the post between the staples and a large headed nail is dropped through the staples to hold the wire in. To drop it, simply lift the nails out.
Putting that many wood posts in rocky ground isn't as fun as it sounds.
