It is just a reordering of the words "wrenched doors open" (not specifically any particular set of doors). Instead of saying "wrenched the doors open", you can also say "wrenched open the doors" to mean pulled forcefully to open a particular set of doors (that you were talking about previously, or can be inferred from the context).
In fact, it is ordered this way to make it sound nicer in parallel with the next part "marched along corridors".