English intervention in Savoy, 1655?

Reading up on the Vaudois on the Armenian Genocide, I stumbled upon this:

http://en.wikipedia.org/wiki/Waldensians said:
In 1655 the Duke of Savoy commanded the Vaudois to attend Mass or remove to the upper valleys, giving them twenty days in which to sell their lands. In a most severe winter these targets of persecution, old men, women, little children and the sick "waded through the icy waters, climbed the frozen peaks, and at length reached the homes of their impoverished brethren of the upper Valleys, where they were warmly received." There they found refuge and rest. Deceived by false reports of Vaudois resistance, the Duke sent an army. On 24 April 1655, at 4 a.m., the signal was given for a general massacre, the horrors of which can be detailed only in small part.

The massacre was so brutal it aroused indignation throughout Europe. Oliver Cromwell, then ruler in England, began petitioning on behalf of the Vaudois, writing letters, raising contributions, calling a general fast in England and threatening to send military forces to the rescue. The massacre prompted John Milton's famous poem on the Waldenses, "On the Late Massacre in Piedmont.". The resistance which lasted into the 1660s was then led by a farmer, Josué Janavel [18]).

If the Genocide's right here-- who knows?-- then what if Cromwell actually did send forces to Savoy on behalf of the Vaudois? Would the French interevene on the side of the Duke of Savoy, and start a Franco-Anglo-Savoyard War? Would the expedition have any affect on the Commonwealth? Is an expedition like Cromwell's even feasible?
 
I think it'd be most likely that the forces would land where they could, set about sieging a city and realise that the massacre was already over and give up. A token piece would probably involve a small amount of money going from one to the other, and the whole situation would be over, the Savoyards red-cheeked with anger and the English red-cheeked at the fact that they were so many months slow in actually doing something useful. At the end of the day I suspect that if we were ever to find Cromwell's motivation behind not doing this, it would be because he knew that by the time his forces would be assembled it would be far too late to do anything, and a war over nothing would be utterly pointless. Aside from helping the Vaudois, he had nothing to gain from a war with Savoy, so there was no point using it as a flashpoint for something bigger. The French would ignore it as they would know as well as Oliver that he had nothing to gain.
 
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