Late last month, Hamas fired 20 rockets into Israel, part of a 150-rocket volley launched by it and other Gaza-based groups. The attack violated an unofficial truce that had stood since April 2011, prompted an Israeli counter-attack that killed up to 15 Palestinians, and that's where it stopped. That might not sound like a great week of Middle East peace, but in many ways it was a reminder of how calm the Israel-Hamas conflict has grown over the last 15 months. These sorts of incidents have often escalated, after all, sometimes disastrously. But this one didn't. Despite the fire, the same forces that led Israel and Hamas into this truce still hold, and though they obviously didn't prevent this attack, they may have played a role in preventing its escalation. Jihadist groups in Gaza, the near-anarchy in the Sinai Peninsula, relations with Egypt, and Iran all preoccupy Israel and Hamas more than their conflict with each other. Consequently, both seem to have decided that, at least for now, that escalating will not serve their interests.

