In Lost Destiny we get a chapter(42) at the end of the Battle of Tukayyid where Focht and Ulric Kerensky discuss the results of the battle. During this discussion Ulric brings up Operation Scorpion, calling it "an annoyance" that did not distract from the battle. In reply Focht remarks "I give you my word, had I known, I would have warned you." Given Focht's nature, detesting underhanded methods and knowledge that acting in good faith with the Clans was the only way he could get them to agree to the Battle of Tukayyid and the Truce of Tukayyid, we can accept, with reason, that he is being honest with Ulric on the matter. As such, if we had to guess on when he learned the details of and the launching of Operation Scorpion it would most likely have been at some point during the battle, most likely at a point where he couldn't do anything about it and trying to do anything about it would undermine what was happening on Tukayyid.