I'm assuming you have a beam construction like a typical old American barn. 250mm to 300mm (10"-12" square wood beams with tongue and groove joints pinned with 25mm to 40 mm (1"-1 1/2" diameter wooden dowels.

As Shortmagnum has stated this structure may not be stable anymore and could fall.

To get stability while moving the structure back into position, you may need several screw jacks(commonly used to support floor joists in a basement) to raise the horizontal beam to the proper height. You need to place these at weight bearing points. The roof and its framework is much heavier than you think.

To bring the walls back together you need several cables or chains that bring them in with a turnbuckle or come-along ( wire cable on a spool with ratchet and hooks on each end). You need to re-inforce the frame work of the good walls so they don't move when you pull it together.

Make your movements slowly and stop after each slight adjustment and look at all parts of the framework to make sure it isn't moving in the wrong places.

If you can, anchor the corners of the good walls with braces (wooden beams at a diagonal) on the inside and possibly cables on the outside.

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