Republic and occupied Pskov, Izborsk, and Koporye in autumn 1240. When they approached Novgorod itself, the local citizens recalled to the city 20-year-old Prince Alexander Nevsky, whom they had banished to Pereslavl earlier that year. During the campaign of 1241, Alexander managed to retake Pskov and Koporye from the crusaders. In the spring of 1242, the Teutonic Knights defeated a detachment of Novgorodians about 20 km south of the fortress of Dorpat (Tartu). Led by Prince-Bishop Hermann of Dorpat, the knights and their auxiliary troops of local Ugaunian Estonians then met with Alexander's forces by the narrow strait (Lake Lämmijärv or Teploe) that connects the north and south parts of Lake Peipus (Lake Peipus proper with Lake Pskovskoye). Battle On 5 April 1242 Alexander, intending to fight in a place of his own choosing, retreated in an attempt to draw the often over-confident Crusaders onto the frozen lake. Estimates on the number of troops in the opposing armies vary widely among scholars. A more conservative estimation has it that the crusader forces likely numbered around 2,600, including 800 Danish and German knights, 100 Teutonic knights, 300 Danes, 400 Germans, and 1,000 Estonian infantry. The Russians fielded around 5,000 men: Alexander and his brother Andrei's bodyguards (druzhina), totalling around 1,000, plus 2,000 militia of Novgorod, 1,400 Finno-Ugrian tribesmen, and 600 allied Turkish horse archers. The Teutonic knights and crusaders charged across the lake and reached the enemy, but were held up by the infantry of the Novgorod militia. This caused the momentum of the crusader attack to slow. The battle was fierce, with the allied Russians fighting the Teutonic and crusader troops on the frozen surface of the lake. After a little more than two hours of close quarters fighting, Alexander ordered the left and right wings of his army (including cavalry) to enter the battle. The Teutonic and crusader troops by that time were exhausted from the constant struggle on the slippery surface of the frozen lake. The Crusaders started to retreat in disarray deeper onto the ice, and the appearance of the fresh Novgorod cavalry made them retreat in panic. It is commonly said that "the Teutonic knights and crusaders attempted to rally and regroup at the far side of the lake, however, the thin ice began to give way and cracked under the weight of their heavy armour, and many knights and crusaders drowned"; but Donald Ostrowski writes