What happened is this. A long time ago one of their Collector ships, an older version, was cruising through Centauri space looking for specimens to collect. Having no luck, they decided to widen the search area and didn't pay much attention to the direction they were widening the search. The next time they jumped to normal space they came in practically on top of a Minbari Morshin-class Carrier. Due to surprise, the Morshin was slow getting off its fighters and was destroyed. The Streib captured several pilots and fled the area. Unfortunately they stopped at several other Minbari outposts on the way out of Minbari territory, leaving the Minbari a nice little trail back to the Streib homeworld. The Minbari sent a rather large fleet thre and punished the Streib by destroying their ship and several orbital installations, then issuing a stern warning against further "collection" missions. A warning the Streib completely ignored.
That was the previous encounter mentioned by Delenn.
As a point of correction, Delenn jumped in with the Agamemnon while piloting a flyer, not a Sharlin.
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