Then I pulled out an old, experimental pair of multi-spectral image enhancement goggles that we were playing around with in the lab back in the late cold war boom of the 80s. You know, when we actually invented everything that Popular Science raves about being the "latest thing" now (except for the stuff that was invented in the 50s and 60s, of course).
There they were! At least two Ogres, possibly more. They have very sophisticated stealth capabilities. Have a look: