ĭefiance returned to Lyran control after the Jihad, following the collapse of the Republic of the Sphere which resulted in a cornucopia of buyers hungry for cutting-edge 'Mechs. After the Word of Blake seized control of Defiance Industries they also produced new variants which were supplied to their Militia for the Jihad. Following the recovery of the Helm Memory Core, Defiance Industries was able to restart production of original-model Flashman 'Mechs in the 3050s and built new variants for ComStar.

ComStar also supplied examples of downgraded Flashmans to the Draconis Combine as part of Operation Rosebud. Thanks to the fact that they owned the only remaining Flashman factory and could replace their combat losses, the Lyran Commonwealth remained the largest user of Flashman 'Mechs throughout the Succession Wars, at least until the unveiling of the Com Guards. The Flashman was saved from extinction thanks to Defiance Industries, which was able to acquire the schematics and produced a downgraded version at their Hesperus II plant. Their heavy use during this fighting saw many destroyed and production of new 'Mechs abruptly stopped in 2796 when Renault-Prime Industries on Wasat was destroyed.

When the League dissolved, the design spread amongst the Successor States but fewer than 500 Flashmans were still operational at the start of the First Succession War. Towards the end of the Star League, several divisions had battalions composed of nothing but Flashmans, and thanks to its popularity these 'Mechs saw frequent use on the front lines. During advances it would stay to the rear to protect against ambushes and provide fire support for its lancemates. This made it one of the most prized 'Mechs in a commander's arsenal during the Star League and saw heavy use by line regiments, typically in a 'fire brigade' role for heavy and assault lances. The Flashman, which was first introduced in 2701, is a 'Mech that is capable of engaging an enemy for extended periods of time with little resupply. The Flashman is an underrated heavy 'Mech, commonly called a 'flashbulb' by MechWarriors for its heavy-energy configuration.

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