Preventable injuries, like car accidents, are the leading cause of death among children and youth ages 1-24 nationwide. Among young children ages 1-4, the most common cause of unintentional injury-related death is drowning; among 5- to 24-year-olds, it is motor vehicle accidents).
I think that the emphasis is on the navy: most communities had an army, but the Greek had an army AND a navy, that is a fleet of ship and soldiers that can fight on water.
The reason for this is that Greece is located on a Peninsula: in order to defend their land they need to defend it both on land (which is the usual case for most communities) and on the waters (next to shores).
