That's about right. The Baltic tribes in the 900s were a disorganised bunch. In the early 13th century, by the time Riga was built and Crossies were traversing Nemunas, the other tribes had unified into, IIRC, at most 5 or 6 principalities (there is a treaty of Halich-Volhyn, dated 1219, which identifies roughly 40 Baltic "dukes" or other rulers, with 5 or 6 being of higher rank). One of the worst defeats the Orders have suffered (and one that spelled the end of the Brothers of the Sword) was against such a regional-ducal army of Samogitians in Saulė/Šiauliai (near the modern-day Lithuanian-Latvian border) in 1236. After this, significant incursions into Samogitian and Lithuanian territory ceased (there have been raids by both sides on frequent occasions).