the 3.7-in AA could be used in an anti-tank role, and was authorized to do so in emergencies, such as when about to be over run, but on the whole the weapon was not well suited to anti-tank use. For one, it was about 2000kg heavier than the German Acht-Acht, making it a difficult weapon to move around and site. Secondly, at low angles of fire, the 3,7-inch was hard on its recoil system and mounting, leading to excess straining. Generally, command control of the 3.7 AA units was normally exercised at Corps level or higher and there was something of a fear, that if the guns were handed over to divisional level command for anti-tank work, the AA units might never get them back; this was certainly a case with the 88's in North Africa where forward units borrowing them from the Luftwaffe Flak battalions, stripped off the flak control equipment to make them lighter and more mobile, but now completely unsuited to AA use. While the siege of Tobruk was one of the few times the 3,7 was used extensively in an AT role, the situation was such that their use there was an emergency where every gun was needed to defend the vital port from German assaults.
Their shoulders held the sky suspended;
They stood and Earth's foundations stay;
What God abandoned these defended;
And saved the sum of things for pay.