Guardians of Riverswams [An Age of Heroes Series Book 2]

When one of their own is murdered in Gulfport, the typically independent Mangarans unite to send a force against that port in a quest for justice. Confronted with no choice but to defend the port through which all their trade depends, the riverers unite when the only riverboat captain with any battle experience takes command for the "good of the river" even though it also means commissioning many apprentices still years away from readiness. Outnumbered in vessels and fighters, the riverers advance for an epic showdown.