Ok, I had the decisions of the two conflated.
If you want to be truly confused try describing Operation Crusader.
I've never understood this one, or much of anything else about 8th Army practice to latter 1942. Both artillery and tank use seem to be at great odds to what had been developing in the UK into 1940, and again during 1941-42. I recall a armor commander who had arrived in the Western Desert in early 1942 complaining about useless "Rat Racing" with the tanks and avoiding everything they had been trained to do in the UK. he seemed to be referring to combined arms practice,
I don't have a good explanation for the evolving 8th Army doctrine.
A key belief in desert warfare was that troops in fixed positions were effectively hostages against the wider tides of the campaign - the British assaulted & easily captured Bardia 3 times (except nobody told the Australians in Tobruk