On the night of 25 August Hindenburg told his staff, "Gentlemen, our preparations are so well in hand that we can sleep soundly tonight”. On the day of the battle, Hindenburg reportedly watched from a hilltop as his forces' weak center gradually gave ground until the sudden roar of German guns to his right heralded the surprise attack on the Russians' flanks. Ultimately, the Battle of Tannenberg resulted in the destruction of the Russian 2nd Army, with 92,000 Russians captured together with four hundred guns. while German casualties numbered only 14,000. According to British Field Marshal Edmund Ironside it was the "greatest defeat suffered by any of the combatants during the war". Recognizing the victory's propaganda value, Hindenburg suggested naming the battle "Tannenberg" as a way of "avenging" the defeat inflicted on the Order of the Teutonic Knights by the Polish and Lithuanian knights in 1410, even though it was fought nowhere near the field of Tannenberg.