Viking warfare and military organization were central to their success as raiders and conquerors. Their armies combined professional warriors and conscripted farmers, led by kings and jarls. The hird, elite warriors sworn to serve, formed the core of Viking forces. Vikings excelled in naval warfare, using advanced longships for surprise attacks and exploration. On land, they employed shield wall formations and berserkers as shock troops. Their raids and expansion campaigns reshaped European power dynamics and influenced medieval warfare tactics.