Kammala jumla mai zuwa: Spain, a lokacin fashewar amincewa bayan babbar nasarar da ba a zata ba a
Nordlingen a shekara ta 1634, ya shirya manyan ayyuka a Jamus don kawo karshen yaƙin da ake yi da Furotesta a can da Netherlands; waɗannan tsare-tsaren sun haɗa da Thomas yana jagorantar rundunar soja a Westphalia, a ƙarƙashin babban umarnin Cardinal-Infante Ferdinand, ɗan'uwan Philip IV. Babu abin da ya faru daga wannan, amma a shekara ta 1635, lokacin da Faransa ta yi yaƙi da Spain (yaƙin Franco-Spanish na 1635-59), Thomas ya yi aiki a ƙarƙashin Ferdinand a cikin Netherlands na Spain: an ba shi umurnin karamin rundunar soja (wanda aka ba da shi daban-daban a matsayin 8,500 ko 13,000) da aka aika a kan sojojin Faransa da suka ci gaba zuwa Luxembourg, umarninsa ko dai ya kiyaye su ko kuma ya hana su shiga tare da sojojin Holland. A ranar 22 ga Mayu 1635 a Les Avins, kudu da Huy, a cikin abin da ya kasance bishopric na Liège, sojojin Faransa da Breezé da Chatillon suka umurce su suka ci shi. Ya yi nasarar tattara ragowar a Namur, sannan ya ja da baya a gaban dakarun Faransa da Holland da suka fi yawa; kuma mai yiwuwa ya yi aiki da sauran yakin tare da Ferdinand. A ƙarshen shekara, ɗan gudun hijira Charles IV, Duke na Lorraine ya isa Brussels kuma ya sadu da Thomas; wataƙila sun kafa kotun hadin gwiwa, kuma tabbas Thomas ya shiga cikin gasa da Duke ya shirya. (A cikin wannan yaƙin Franco-Spanish, an jawo Piedmont cikin gwagwarmaya tare da Faransanci, kodayake da farko ya guji cikakken sanarwar yaƙi; saboda haka, Thomas yana fama da yaƙi da ƙasarsa.)