invade Sakhalin island
... that the Mongols were advised to invade Sakhalin island in 1273 by marching across the frozen Strait of Tartary?
... that the Mongols were advised to <b id="mwCV4"><a href="./Mongol_invasions_of_Sakhalin" id="mwCV8" rel="mw:WikiLink" title="Mongol invasions of Sakhalin">invade Sakhalin island</a></b> in 1273 by marching across the frozen <a href="./Strait_of_Tartary" id="mwCWA" rel="mw:WikiLink" title="Strait of Tartary">Strait of Tartary</a>?