The hotchkiss have the ability to choose units so you can see how strong the defense is on the first attack of a city. It takes 2 1/2 Steamers or 12/24 workers for one square. I think it clear 24 attack and defense 8 units that create more of themselves is better than the 2 1/2 steamer equivalent. Even if we take a city or two off of Hotchkiss to build steamers, it is better to upgrade the workers. I left some but I think the next player should upgrade them all, especially foreign ones. A town builds 1 Steam roller or one Hotchkiss, which is the equivalent of 5 native or 10 foreign partisans in terms of working power.