Recent historical scholarship has reappraised the impact of the Lebanese Crisis of 1958, casting it as a partial origin story for the sectarian populist militancy that spiraled into an internationalized 15-year civil war while also sparking escalating Cold War tensions. However, while these studies have largely relied upon a combination of United States archival declassifications and Lebanese press archives, the perspective of activists who participated in the events of the crisis has been comparatively neglected, leaving the legacies of the conflict for grassroots political mobilization out of the English-language historical record and casting the events of 1958 as an exclusively Lebanese story. Instead, this paper draws upon a combination of oral histories, memoirs, and political party documents to examine how popular uprisings during the Lebanese Crisis of 1958 reshaped norms and subjectivities that endured through the counterrevolutionary restorations of the subsequent decade, while also demonstrating the nascent Palestinian national movement’s potential as a potent guerrilla force. The twin case studies discussed within this paper are rooted in social biographies of activists affiliated with the Arab Nationalists’ Movement (ANM), the Pan-Arabist precursor of the Palestinian national movement’s leftist wing and much of the Arab New Left. The first case study focuses on the port area of Tripoli, where Palestinian ANM activist Salah Salah forged political coalitions while coordinating resistance strategies and weapons smuggling across the border with Syria. The second case study centers the ANM-controlled Solidarity Sports Club of Tyre and its leader, Muhammad al-Zayyat, whose projects of state building from below and armed resistance deepened the Movement’s social bases while reshaping the gendered boundaries of the local political community. Collectively, the case studies explore how grassroots political mobilization during the brief civil war of 1958 facilitated new revolutionary coalitions that would fuel Palestinian armed resistance into the 1960s and beyond, while also empowering popular institutions that would play central organizing roles well until the Israeli invasion of Lebanon in 1982. Further, the paper examines the role of the Lebanese security state, whose violent repression of activists and besiegement of the port areas of Tripoli and Tyre foreshadowed the functional siege placed around Palestinian refugee camps in Lebanon between 1959 and 1969.