2.6: When opening battle calc on own territory on own turn, your country is selected as both attacker and defender.

[asvitkine]

2.6: When opening battle calc on own territory on own turn, your country is selected as both attacker and defender.

See discussion here: https://forums.triplea-game.org/topic/2999/2-6-release-getting-close-need-volunteers-to-help-beta-test-2-6/190?page=10

Although one could argue this "could" be helpful if you want to simulate an attack with the units of that territory, that functionality already exists via "swap sides" button.

Where it's not helpful, is when the units can debuff opposing units, so the stats shown (I guess just "power"?) are not accurate. In 2.5, it would default to an arbitrary hostile player.