Lake Peipus
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).