A logical houserule as Sweboz would be to not go for cities, just the German villages around your starting lands, then no more new conquests. Raid8ing is fine, but no new conquests and no sieges at all until a certain date (historically we are out of EB timeframe before Germanic invaders took the first city).
And by raiding I mean invade, fight any field army you meet, lay siege to a city for a turn, then move on to next territory or home. I think I shall try and use that one myself when I embark on next Sweboz campaign.
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