Russian troops launched an overnight attack on Ukraine with strike drones and various types of missiles on September 5. Most of the enemy targets were destroyed by air defense units, the Air Force of the Armed Forces of Ukraine reports.

Ukraine’s air force said Russia launched 805 drones into Ukraine overnight and 13 missiles, with Ukrainian defense units downing 751 drones and four missiles.

Many of the drones aren’t particularly fast or high-tech, but they are cheap enough for the Kremlin to launch more than 700 in one night, in an effort to overwhelm Ukraine’s air defenses. Here’s what we know.