Gathering information for a medieval campaign I found the presence of the Hanseatic League in a number of major conflicts. A coalition of city states they did raise armies possibly similar to the army list posted two weeks back.
Here, from M. Laser History are two videos, the first is a general overview of the Hanseatic League and the second focuses on the trials of an aspiring merchant.
Here in Norfolk England during the 13th Century Kings Lynn was the third largest port in England and was part of the Hanseatic League. Still standing are the last Hanseatic warehouses in England along with merchant houses from the time. Well worth a visit.
"I would rather have a russet coated Captain who knows what he fights for and loves what he knows. Than he who calls himself a gentleman, and is but little else." Oliver Cromwell