This commentary argues that Hezbollah felt duty-bound to open a front in Southern Lebanon to ease Israel’s military pressure on Hamas. Hezbollah indicated that its participation in the war will continue until reaching a ceasefire between Israel and Hamas, apparently expecting the hostilities to last only for a few weeks. However, the war dragged on for months as Israel pledged to keep it going until destroying Hamas and, contrary to what Hezbollah expected, pushing it away from the border area to ensure the safety of its residents in the upper Galilee settlements. The fighting in Southern Lebanon turned into a war of attrition against Hezbollah as Israel eliminated most of its field commanders by drone attacks. Should Israel succeed in evicting Hezbollah from the border area, it would lose its claim to resistance to liberate Lebanese territory still occupied by Israel, increasing the pressure on it to disarm like all other Lebanese factions when the civil war ended in 1989.