http://libraryqxxiqakubqv3dc2bend2koqsndbwox2johfywcatxie26bsad.onion/library/andy-durgan-international-volunteers-in-the-poum-militias
Rovira opposed the sending of any troops to the rear as he knew it would be used against the POUM. Instead Rovira accompanied by a “strong escort” of members of the Shock Battalion, who were already resting behind the lines, set out for Binéfar to investigate. On the way, they were joined in Sietamo by “several hundred” troops from a Battalion of the CNT-led 28 th Division.