The reason your barracks froze is because with Time of Bondsmen, you need to rebuild the same level of barracks you have to get the new units. For Casse I'm not exactly sure what units it unlocks, Galaiche and Sotaroas at the least. When you have a barracks building when the event is received it stops building and "freezes," an unfortunate side effect. This is why its always useful to go through all your towns every turn. And Time of Soldiers is what will give you access to the two elites I mentioned.
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