Preventive war/the preemptive strike, defined as the identification of a major threat developing among one’s enemies and the taking of action to remove that threat before it materializes, was once central to Israel's security concept. Since the rise of Hamas to power in Gaza and the Second Lebanon War against Hezbollah, however, the IDF has abandoned this practice. Instead, strategies were developed to keep escalation below the threshold of war – the “Campaign Between the Wars” in the north and repeated limited operations in Gaza. Notwithstanding these efforts, both Hamas and Hezbollah subsequently evolved, over the course of almost two decades, into terrorist armies that are a significant threat to Israel. Two recent cases illustrate this trend: Israel's response to the development of Hamas's offensive capability, with an emphasis on tunnels, starting in 2015; and Hezbollah's conversion of rockets into precision-guided rockets starting in 2018. In both cases the option of a preventive war was raised but rejected. In direct response to lessons learned from the Iron Swords War, I propose that the preventive war/preemptive strike be restored to Israel's strategic toolbox. The external and internal legitimacy for doing so stems from the fact that Israel has returned to the era of “wars of no choice.”