The Cromwell tank, officially designated as the Tank, Cruiser, A27M, has proven to be one of the most successful Commonwealth armoured vehicles. Developed as a cruiser tank, it prioritized a balance of speed, firepower, and manoeuvrability, embodying the Commonwealth doctrine of using 'cavalry' tanks for rapid, mobile warfare with direct support for troops provided by slower 'infantry' tanks. Originally armed with a 75mm gun, many Cromwells have been retrofitted with a Tesla cannon to make it relevant in the new era of warfare.