The Pentagon said Tuesday Libyan forces fighting the Islamic State have been “spectacularly successful” in retaking territory and pushing the Islamic State deep into its stronghold in the northern coastal town of Sirte, which is why the U.S. is helping the effort.

The United States began airstrikes Monday to provide close air support for fighters aligned with Libya’s newly formed Government of National Accord, or “GNA” which is supported by the U.S. and other Western nations. Five strikes were conducted Monday, and two more Tuesday, according to the Pentagon.