The aim of the present study was to test the measurement model and measurement invariance of the Impact of Event Scale (Arabic version) in a large sample of Palestinian children. We estimated (Study 1; n = 610) the measurement model using confirmatory factor analysis. In Study 2 (n = 864), we conducted multigroup (girls and boys) tests of measurement invariance. We pooled the data collected from the participants in the first two studies (Study 3, N = 1474) to assess overall score reliability, as well as the IES’ convergent and divergent validity vis-à-vis other measures of child wellbeing and mental health. The outcomes of the statistical analyses supported an invariant 13-item measurement model (intrusion, avoidance, and hyperarousal) for CRIES-13A. Intrusion and hyper-arousal together made up a first-order domain of symptoms (re-experiencing). The combined findings of these studies suggest that the CRIES-13A displays robust psychometric properties and may be used in contexts of military violence.