In 19 BBY, the tactical droid served under Admiral Trench during the Battle of Anaxes in the Clone Wars. He arrived at a crash site of a Republic Gunship on a speeder after a brief skirmish between Clone Force 99 and a group of B1-series battle droids.
A BX-series droid commando approached him as the tactical droid talked with Admiral Trench, the commando addresed the hologram, reporting that the clones had used unorthodox strategies to defeat the droids. Later, the tactical droid reported to Trench from an ambushed separatist outpost, informing the Admiral that a clone strike team had captured the outpost and deserted it, the Harch told him that he saw no tactical value in taking the outpost, however, he informed the droid that the clones' next target would be the Cyber Center, and that he wanted the tactical droid to connect him with the outpost immediately. The tactical droid later reported to Trench after the clones were chased out of the Cyber Center that they had made a connection with the planet Skako Minor while they were there, which alarmed Trench.
After Trench was informed of the connection with Skako Minor, the Admiral contacted Minister Wat Tambor, alerting him that the Republic was going to attack the Techno Union. Although Wat Tambor initially dismissed Trench's warning, he ultimately accepted it and prepared for the clones' arrrival
The T-series military strategic analysis and tactics droid appeared in the first episode of the Star Wars: The Clone Wars TV series' first episode of the show's seventh season's "The Bad Batch." Which aired on February 21, 2020.