Would France Attack Syria Without the U.S.?

In a word, "yes". France could act unilaterally should Obama receive another shock from the dysfunctional US Congress by not approving action. France already has shown it can and will intervene in its former turf- Africa and Middle East. They intervened the Islamist fighters in Mali just recently sending them into hiding. It is totally plausible and their public opinion is 50% in favoring punishing Assad of Syria for the use of gas. Syria was a former colony of France long ago.France does not need permission or approval from its government to act.

French aircraft with Scalp cruise missiles that have a range of about 300 miles would be fired from Mirage and Rafale fighter jets. French fighters could likely fly directly from France, as they did against Islamic radicals in Mali earlier this year, with support from refuelling aircraft. France also has six Rafale jets at Al Dhafra air base, near Abu Dhabi in the United Arab Emirates on the Persian Gulf, and 7 Mirage-2000 jets at an air base in Djibouti, on the Red Sea. The French also have naval ships, including an aircraft carrier that could be deployed.

So, should the US Congress veto Obama's plan to attack Syria, only France seems, at this point to be able to carry out a limited attack. But, would Obama override the Congress veto should it not go in his favor? He might, but he really is only doing this to save his own face and some conviction about the use of gas.