Well, an army of 1,000 was quite a lot in medieval Scandinavia, especially if the army left home for what would certainly be more than a year. I don't remember which port, but I don't think you are confusing the crusades, as both Norwegians and Danes went on several larger expeditions to the Levant.
"The Northern Crusades" is, IIRC, an Osprey book, and from what I've heard (mainly from Swedish historians) it's so-so with the historical accuracy, although it's probably still worth the money and contains good plates.
The "Sword Brethren" (
Fratres Militae Cristii) were formed after the wends/vends had been officially converted (early 13th century, by this time the vends themselves took part in the crusading), the person behind the creating of the order was bishop Albert of Riga (or maybe it was Albrekt, don't remember) who needed permanent military aid in Livonia. Interestingly enough, they were treated as lower class knights, and different from other fighting crusader orders like the Templars enjoyed no popularity; it was an organization for poorer german knights and nobles.
I think the name of the other order was Dobrzyn or something like that, yes. The order consisted of eighteen knights at its peak

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