Avar Wars
... that during the Avar Wars, disease killed 90 per cent of Charlemagne's horses?
... that during the <b id="mwBWo"><a href="./Avar_Wars" id="mwBWs" rel="mw:WikiLink" title="Avar Wars">Avar Wars</a></b>, disease killed 90 per cent of <a href="./Charlemagne" id="mwBWw" rel="mw:WikiLink" title="Charlemagne">Charlemagne</a>'s horses?