alliance
...that the Byzantine Empire and the Mongol Empire formed an alliance in 1263, and 4,000 Mongol soldiers were dispatched in 1282 to help defend Constantinople?
...that the <a href="./Byzantine_Empire" id="mwEtE" rel="mw:WikiLink" title="Byzantine Empire">Byzantine Empire</a> and the <a href="./Mongol_Empire" id="mwEtI" rel="mw:WikiLink" title="Mongol Empire">Mongol Empire</a> formed an <b id="mwEtM"><a class="mw-redirect" href="./Byzantine-Mongol_alliance" id="mwEtQ" rel="mw:WikiLink" title="Byzantine-Mongol alliance">alliance</a></b> in 1263, and 4,000 Mongol soldiers were dispatched in 1282 to help defend <a href="./Constantinople" id="mwEtU" rel="mw:WikiLink" title="Constantinople">Constantinople</a>?