For this reason they pushed forward the construction of their work with posterns and entrances and means of introducing the enemy, being eager to have it finished in time.
"The History of the Peloponnesian War"
Thucydides
The town, as Cantapresto had long since advised him, had its secret leniencies, its posterns opening on clandestine pleasure; but there was that in Odo which early turned him from such cheap counterfeits of living.
"The Valley of Decision"
Edith Wharton
The circumference of the walls is nearly two miles, and there are four principal gates besides posterns-the North, East, Bridge-gate, and Water-gate.
"Vanishing England"
P. H. Ditchfield