ZAGREB, Croatia (AP) — The U.S.-led military campaign plan to retake Iraqi territory held by the Islamic State group calls for attacking the extremists from several directions simultaneously, and its success depends on getting more Arab help, the top American military officer said Sunday.

“We want them to wake up every day realizing that they are being squeezed from multiple directions,” Army Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, told reporters, referring to the Islamic State group, which also is known by the acronyms ISIL and ISIS.