Professional Valanian Hussars existed prior to the Kingdom's fall and although it's been nearly two decades since Valania's Armies crumbled, most of the Hussars escaped unharmed. Prior to the Kingdom's Annexation, the Hussars were spotted retreating near the forests bordering Vorst rather than risk defend Voltas, Valania's doomed capital. The Valanian Hussars' officer corps were primarily aristocratic, however, the mid echelons and below composed of enlisted commoners. Portions of remaining Hussars and Mounted Regiments have since waged an aggressive campaign against the Sarifen occupation with varying successes so your character's existence is certainly plausible!

[b]Edit:[/b] Going to Hibernate now. I'll be up in 8 or 9 hours for more questions so feel free to drop more through PM or here and I'll be happy to help 8)