I can certainly try. While Canada has just started air operations, other coalition allies have been active for quite some period. You'll recall how quick the ISIL advance was into Iraq. In fact, the map I put up really shows their areas of advance towards their main objective, which is the capture of Baghdad.
In that quick advance, they were gaining momentum, travelling in some very large and sometimes armoured formations that in many events as they approached Iraqi-controlled areas were able to quickly advance through there, in part just by the mass and sheer size of the force that was coming forward. Allied air activity has blunted that advance.
In fact, as you may have heard—it was certainly reported publicly—they no longer travel in large formations because those are simply too easy a target for air power to take forward. We've now seen ISIL move to a more asymmetric style of attack, which, by and large, while still a challenge for Iraqi security forces, does not pose the same level of threat as their massed advances previously.