With the Defiant being largely replaced in frontline use, in July 1941 a target-towing version of the Mk.Ⅱ was proposed. Powered by the Merlin ⅩⅩ engine, its standard heavy turret was replaced by a built-up rear fuselage with a sliding hood for the drogue operator's cockpit. The housing for the drogue was faired beneath the rear fuselage and a windmill was fitted to the starboard side. Designated as the TT.I, an order was placed for 150 aircraft carrying serial numbers DR863 to DS169. However, the last few were cancelled and the final Defiant off the line was DS156. Although mundane, target-towing was an essential task for the training of land and naval anti-aircraft gunners. It was also used for firing practice by new fighter pilots. In these cases, the windsock-like drogue was replaced by a banner-like flag.
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