I stopped drilling holes for termites ~1990. I found that using 4-6' "stingers" I could effectively inject material around basement walls/ under slabs.
My problem with Termidor is that it is a "stealth" insecticide, so it doesn't provide the repellent effect you get with nearly all other materials. You drench the mounds in your yard and the ants are likely to take off in any direction, including toward the house.
I would bet you could get acceptable results with the bifenthrin trade named Talstar P (/Talstar One) diligently applied with a garden sprayer (according to label directions).
If you anticipate future battles I'd recommend you get some. I buy 3/4 gallons off eBay, from whomever has the best price.
Checking, it looks like this guy is right; you'll be hard pressed to find a better number than $47.95 and free shipping. http://cgi.ebay.com/Talstar-Pro-3-4-Gal-Insecticide-Ant-Roach-Flea-Control-/140385711134 -----