to lay a siege
...that in the course of the Crimean War, the British and French Navies undertook three attempts to lay a siege to the town of Taganrog?
...that in the course of the <a href="./Crimean_War" id="mwAdI" rel="mw:WikiLink" title="Crimean War">Crimean War</a>, the British and French Navies undertook three attempts <b id="mwAdM"><a class="mw-redirect" href="./Siege_of_Taganrog_(1855)" id="mwAdQ" rel="mw:WikiLink" title="Siege of Taganrog (1855)">to lay a siege</a></b> to the town of <a href="./Taganrog" id="mwAdU" rel="mw:WikiLink" title="Taganrog">Taganrog</a>?