I suppose I should consider myself lucky that it's been
a couple years since the last invasion. They used to be
much more frequent.

I've never used insecticide. The last time I saw someone
use Raid, it seemed spectacularly ineffective. The ants
were swimming around in the stuff. On the other hand,
I once stopped an ant trail in the bathroom by spraying
Tilex tile cleaner on it. It killed the ants instantly
and the residue kept them from rebuilding the trail.
I might try that again, if I decide to go nuclear.

Right now, I'm trying to knock down the invasion by hosing
down the ant trail on the outside of the house every couple
of hours. That works during the day, but they build it up
again at night. Ants don't appear to sleep.

Any other tactical suggestions cheerfully accepted.