In truth there really was no reason for Thaddeus to ascertain where the commanders where meeting up. After all he wasn't at a proper rank to really create battle plans. Anytime he was of higher rank his major weakness of no tactical thinking would inevitably leak through. One man can only do so much. Engagements can be won by one man, but wars require the full unison of a military. A true leader can both smash skulls in the name of the lord as well as lead their legions to victory. Thaddeus had might, but not the mind to really value the life of the individual. And thus a vicious cycle of being promoted due to his combat prowess and being demoted because of his high casualty rates started. They couldn't have him in a high position and they couldn't let him be discharged. Colonel suited Thaddeus just fine. But it did create a rather large problem. Thaddeus Gaunt had no squad to actually lead.

Squads around him had the nasty habit of dying, both the enemy's and his on. It was both a blessing and a curse for Thaddeus. It was a blessing because it forced him to propel himself to new heights of achievements for his God, and it was a curse because he never really created lasting bonds with his squad mates. Generals grew wise to this and would often assign him to squads filled with greenhorns to save valuable veterans. Of course this increased his squad casualty rates even more due to the inexperience of his comrades. He could go into battle with no squad, but a matyr without any sense is no really matyr at all. He stepped up to General Bishop and waited to speak with him after those of higher rank were done with him. After asking permission to speak he started his plead.

"Sir, I am Colonel Thaddeus Gaunt. I was asked by Admiral Jameson to assist our Gazere allies to secure the area and prevent the EDF incursion. Unfortunately I have no troops to call squad mates. If it be by your blessing General BIshop, I request to join and perhaps lead one of the squads that will see combat" 

General Bishop had every right to say no. If he did say no, then he'd have to ask what his duties would be during his stay during this defensive campaign.