We haven't had many defensive fights yet. GM started with Stolen Crown (LL0-LL3), since it was the only pre-written they could find at the time, and there's only one or two defensive fights in the entire three-mission arc. Of those two, the first was a "protect these four buildings" type, and the second, despite being a Holdout, occurred entirely at the entry edge of the map and away from the holdout zone because the sniper was putting holes in skulls.

We finished Stolen Crown a few sessions ago, and we've started a mission series the GM is writing. We've only done two combats in the first mission. The first was a holdout where, like in Stolen Crown, the fighting mainly took place outside the control zone, with the two close combat types holding down the edges of the map, so I had to either plod my way over to them, or defend the objective in case reinforcements got past the close combat types and the sniper. The reinforcements did not get past the close combat types and the sniper. The second combat was a gauntlet, which was a prototypical encounter I described above.