1) Entrenchment 2) Fortification 3) Munition 1) Entrenchment 2) Retrenchment 
• (n.) Any defensive work consisting of at least a trench or ditch and a parapet made from the earth thrown up in making such a ditch. • (n.) Any defense or protection. • (n.) An encroachment or infringement. • (n.) The act of intrenching or the state of being intrenched.
In·trench'ment noun [ From Intrench .] 1. The act of intrenching or the state of being intrenched. 2. (Mil.) Any defensive work consisting of at least a trench or ditch and a parapet made from the earth thrown up in making such a ditch. « On our side, we have thrown...
noun an entrenched fortification; a position protected by trenches