Examples from literature

• Not far from where the boys landed they discovered the time-worn earthworks of what had once been the old fort. 
• The city of Boston was girdled by rapidly increasing earthworks. 
• The gun-boats threw heavy shells into the fort and behind the earthworks all night, keeping the enemy awake and anxious. 
• The spot chosen was levelled, a strong earthwork was erected round it, and then the surrounding ground was removed. 
• We were sitting, the three of us, in a slanting fashion with our backs to the earthworks of the trench.