Map of 1673 showing the circumvallation works by the army of Louis XIV of France that isolated the besieged city of Maastricht and forced it to surrender after two weeks.
Unknown author<span style="display: none;">Unknown author</span>
Ubachs, P.J.H., en I.M.H. Evers, <i>Tweeduizend jaar Maastricht. Een stadsgeschiedenis</i>. Zutphen, 2006, p.141