bulwark
noun
a wall of earth or other material built for defense; rampart.
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
He left General Totten on the stairs, leaped down the remaining steps, and ran to a group of watchmen and night employees of the State House who were bulwarking the soldiers.
From All-Wool Morrison by Holman Day