I got something in sarna.net
http://www.sarna.net/wiki/Barony_of_StrangIt seems that Amaris city was very fortified and protected by a Battalion of mechs plus tanks and infantry (JF sourcebook says it is a regiment).
I suppose the mechs should not be latest models but were probably in good conditions and had some veteran and elite pilots in at least one company (von Strang's World was known by its healthy from diamond mining)
It is not clear to me what is the size of the force used by the Jade Falcons, but it seems that the Jade Falcon Keshik commanded by the Senior Khan Elias Crichell was responsible for the operation
In total, he had 3 Trinaries for 45 mechs at his disposal plus 1 Trinary of Battlearmor (60 Elementals).
In addition, One Trinary of aerospace fighters plus one Jumpship and 3 Dropships.
It seeams that they should have used their entire forces. Probably the BV2 balance is about 3xJF to one of the defenders.