 The hemmema replaced the galleys that had made up the core of the Swedish archipelago fleets until the mid @-@ 18th century . Compared to galleys , the hemmema had a deeper draft and was slower under oars , but offered superior accommodation for the crew , carried more stores , was more <unk> and had roughly ten times as many heavy guns . It could be propelled by either sails or oars but was still smaller and more <unk> than most sailing warships , which made it suitable for operations in confined waters . 
