The production of cannon was steadily progressing. The second cannon was undergoing a period of chamber expansion, while the third cannon was stockpiling the materials.
They would have four twelve-pound cannons a month later if they were lucky enough. It was without question that they held an unprecedented superiority in firepower. But, what Roland concerned about that was how to ensure that the advantage would turn into a victory.
As a mechanical engineer, before finding himself in this era, his understandings of war, like most people, was from history, movies, and games. If it was just hand-to-hand combat, he would give Carter and Iron Axe free reign to command. However, this was a totally different war and none were more familiar than him with the combat mode of the hot weapon war.
In this case, all he could do was to use all of his knowledge to make a detailed plan of action.