The looming battle for Rafah — a city on the southern end of Gaza, farthest from where Israel’s invasion began — embodies the brutal dynamics of the conflict. The war is both a military operation against Hamas, an extremist organization that has vowed more terrorist attacks against Israel, and a humanitarian crisis that has brought death, hunger and displacement to Gazan civilians.

The humanitarian crisis is clear. During its four-month invasion of Gaza, Israel has killed more than 29,000 people, many of them children. The civilian toll, as a share of the population, is among the highest from any modern war. Many more Gazans have fled their homes and are struggling to find food. An assault on Rafah, which has become a refuge for more than half of Gaza’s population, would worsen the misery.

But the military importance of Rafah for Hamas is also real, experts say. On Oct. 7, Hamas invaded Israel, murdering, sexually assaulting and kidnapping civilians. Since the attack, Hamas’s leaders have refused to release dozens of Israeli hostages. With Israel having taken control of much of northern and central Gaza, at least some Hamas leaders and their weapons seem to be in tunnels under Rafah.

Two things, then, are simultaneously true: To defeat a violent enemy, Israel may need to invade Rafah. And an invasion of Rafah would almost certainly worsen the war’s awful civilian toll.

In today’s newsletter, I’ll examine three questions: What does Israel hope to accomplish by invading? What might forestall an invasion? And how might the civilian toll be reduced if an invasion happens?