Nyorai kupfuurira kweiyi ndima - Hengl akabatana neuto reGermany semukuru mukuru muna 1914, ane makore 16, achishanda pakutanga muReserve Infantry Battalion Nr. 21 pedyo neYpres muna 1914. Gore rakatevera racho akaendeswa kuEastern Front kunoshanda kuRussia. Muna October 1915, akaendeswa kumaodzanyemba kunharaunda yeSerbia. Akadzokera kuFrance muna 1916, kunoshumira pedyo neVerdun; musi wa 23 March akasimudzirwa kuva mukuru wemauto saLeutnant. Iye ipapo akadzokera kumabasa muRussia. Pashure pokukumbira kutamiswa kubasa rekubhururuka, akatanga kudzidziswa kwevatariri vepamhepo musi wa 23 February 1918. Paakapedza kudzidza, akaendeswa kuFA ((A) 295 yoUmambo hweBavaria. Mutyairi wake wenguva dzose mundege yokuongorora ine zvigaro zviviri akanga ari Johann Baur. Vaviri ava vakapiwa zvikwereti zvitanhatu zvakasimbiswa kukunda pamwe chete, kutanga nekukunda kaviri pamusoro peSPADs musi wa17 Chikunguru 1918 pamusoro peCourton Wood. Vatyairi vendege vaHengl naBaur vakapfurwa pasi seri kwemitsetse yeBritain mukati meHondo yechitatu yeAisne
; zvisinei, vakanunurwa pakutapwa nemauto anobva kuWürttemberg. Vaviri vacho vaizorova mamwe makwikwi mana muna October 1918, naHengl achihwina wechinomwe achitsvaka mumwe mutyairi wendege.