A Shortsword is a sword designed to be used with one hand, leaving the other hand free to use a shield. It is a type of Resource used to train certain Units. Unlocked with Sword knowledge.
Shortswords are unlocked by the Sword knowledge, this knowledge comes around Bronze age.
To make one Shortsword you need 0.2 Leather and 0.8 Bronze or 0.8 Iron or 0.3 Steel.
Troops you can train with Shortswords: