 Nyora kupfuurira kweiyi ndima - Rustem aive mutambi wehwamanda mu2nd Infantry Division yeRoyal Serbian Army, iyo yakakurumbira Iron regiment, panguva yeHondo Yenyika I. Musi wa12 Gunyana 1916 Hondo yeKaymakchalan, nokuti gomo reKajmakčalan pakati pevaSerbia neBulgaria Rila Division yakatanga. Kubva musi wa26 kusvika musi wa30 September, pamusoro pegomo racho pakachinja maoko kakawanda, asi vaBulgaria ndivo vaiva nesimba uye zvaiita sokuti vaSerbia vaizofanira kudzokera. Pakarepo, kurwisa kweSerbia kwakatambwa naRustem uye mauto eSerbia akarwisa vaBulgaria vakashamisika avo vakadzokera kumashure, vachibvumira maSerbia kukunda gomo uye kupedza hondo musi wa30 Gunyana. Mutungamiri Dimitrije Milić, uyo asina kupa mutongo wekuregererwa, akadana Rustem kuti aendeswe kudare rehondo nekuda kwekusateerera asi panzvimbo pezvo, mushure mekunge Rustem amuudza Ini ndaifanira kuzviita, kunyangwe iwe wakandidzinga kana kwete, akamupa menduru. Achiongorora nzvimbo yehondo gare gare, Milić akawana dhiramu reramu, asi hazvizivikanwi kana Rustem aiziva kuti varwi veBulgaria vakanga vakadhakwa. Muna 1917, nhau dzekudzorera kunotyisa kweBulgaria mushure mekumukira kweToplica vanopfuura zviuru makumi maviri vakafa kumaodzanyemba kweSerbia yakatorwa, yakasvika kuSerbian Army Salonika Front. Varwi vakawanda vaibva munharaunda yacho, kusanganisira Rustem. Akaverevedza achienda kunzvimbo yaiva pedyo yevaBulgaria, akateerera ndokuyeuka kurira kwehwamanda dzavo. Mazuva akati gare gare, aine varwi vaviri, akakambaira achienda kunzvimbo yevaBulgaria pakati pousiku uye varwi pavakakandira magirinedhi, akaridza kurwisa kwevaSerbia. Mukai, hondo yeSerbia inomhanya mberi pakurwisa kusingakarirwi. Rustem akabva adzoka achinyemwerera ndokuita kuti vaBulgaria vadzoke. Vanyonganiswa, uto reBulgaria rakadzokera shure uye vaSerbia vakatora nzvimbo. Mangwana, Rustem akapiwa menduru dzakabva kumuchinda-mutongi Alexander nomukuru mukuru weFrance Louis Franchet dEspèrey. Pakati pemenduru dzake paive neOrder yeKarađorđes Star uye Albanian Commemorative Medal. 