On 2 February 1348 a Teutonic raiding army caught a Lithuanian force at the Strėva river and broke it, killing Narimantas and Manvydas, two sons of Gediminas. The Order’s chronicler claimed eighteen thousand Lithuanian dead against sixty-eight of his own, a figure no historian accepts.
The Battle of Strėva was fought on 2 February 1348 on the banks of the Strėva, a tributary of the Neman east of Kaunas, between a Teutonic raiding army under the grand commander Winrich von Kniprode and a Lithuanian force that came up to intercept it. The Lithuanians were beaten, and two sons of Gediminas — Narimantas and Manvydas — were killed. It was the largest open-field defeat Lithuania suffered in the middle of the fourteenth century.
The battle matters less for what it decided than for what it shows. The war between the Order and Lithuania was not a war of battles at all: it was a hundred and forty years of raiding in which two or three set-piece engagements stand out precisely because they were rare. Strėva is one of them, and the way the Order’s chronicler wrote it up — eighteen thousand enemy dead against sixty-eight of his own — is itself evidence of how much such a day was worth to a crusading order that spent most of its war burning villages.
By the 1340s the Order’s war had settled into an annual rhythm. Twice a year, in winter when the marshes froze and in high summer when they dried, columns went out from Prussia and Livonia into Samogitia and the Lithuanian interior to burn settlements, seize livestock and people, and destroy the timber forts. Between 1305 and 1409 the Order mounted something like three hundred of these campaigns; the Lithuanians answered with about forty-five of their own. Almost none produced a battle, because neither side gained by fighting one.
The raids were also a social institution in Latin Europe. Nobles from Germany, England, France and Bohemia came to Prussia for a season’s crusading against the last pagan power on the continent, were feasted at Marienburg and Königsberg, and went home with the prestige of having fought the heathen. The Order needed them for manpower and for the political cover they gave, and the winter campaign of 1347–48 was one of the large ones, with foreign guests riding in the column.
The army crossed into central Lithuania early in 1348 under Winrich von Kniprode, then grand commander of the Order, serving the grand master Heinrich Dusemer. It split into two divisions and spent about a week burning the country, which was the point of the exercise. The Lithuanians shadowed it and gathered a force to catch it on the way home.
They caught it at the Strėva on 2 February. Winter had done to the river what winter does in Lithuania, and the ground favoured the defenders: the crusaders could get across only a few at a time, with Lithuanian archers on the far bank. For a while it worked, and the Order’s chronicler concedes that the missile fire hurt.
What the Lithuanians could not do was finish it. Their strength was mobility and missiles, and against armoured horsemen those win a skirmish rather than a battle. When enough crusaders were across, the heavy cavalry counter-charged, the Lithuanian formation lost its order, and the fight turned into a pursuit — the phase of a medieval battle in which nearly all the casualties are inflicted.
Narimantas, Gediminas’s son and prince of Pinsk, was killed, and so was his brother Manvydas. Whether Kęstutis commanded in person is not certain: the Lithuanian tradition names him or Narimantas, and later accounts add his brother Algirdas, whose presence no source establishes. What is certain is that the Gediminid house lost two of its generation in an afternoon.
The Order’s account adds that so many Lithuanians drowned that the knights could afterwards cross the river dry-shod on the bodies. This is the detail that has attracted the most criticism, and rightly: the Strėva is a shallow stream, shallower still in February, and it cannot drown an army. The image is a literary one — it recurs in medieval battle writing wherever a river is present — and its survival into modern accounts is a good illustration of how a chronicle’s rhetoric becomes a textbook’s fact.
The numbers come from Wigand of Marburg, the Order’s herald and chronicler, who gives about eighteen thousand Lithuanians killed or drowned against eight brother knights and sixty other men. Nothing about that survives examination. An army of eighteen thousand is larger than anything fourteenth-century Lithuania is likely to have put in the field at short notice to chase a raiding column, and a defeat on that scale would have ended its capacity to fight for a generation.
It did not. Lithuania was raiding Prussia again within a few years and fought the Order for another six decades. The right way to read Wigand here is as an official account written to be read aloud to the Order’s patrons and guests, in which the ratio is the message: our losses were nothing, theirs were annihilation, and God was plainly on the side of the brothers. The battle was a real and serious Lithuanian defeat; it was not the one Wigand describes.
The immediate consequences were felt in the east rather than the west. Lithuania’s grip on its Rus’ dependencies loosened: its influence in Pskov went in 1348 and in Novgorod the same year, and Smolensk drifted afterwards. The Order followed up by destroying the fort at Veliuona and raiding the Šiauliai country more or less unopposed.
What it could not do was convert the victory into conquest. Heinrich Dusemer resigned the mastership in 1351 and Kniprode succeeded him in 1352; more decisively, the Black Death reached the Baltic and took out the manpower and the flow of crusading guests on which the reisen depended. The corridor through Samogitia the Order had been trying to open since the 1230s stayed shut, and the next set-piece meeting of the two powers was fought at Rudau in 1370 with the same two brothers on the Lithuanian side.