In the 1500s, they were nicey,nice, quietly growing. In france, under Francis I, France was tolerant of all religious views -- but the H's got into the mood to bite the hand and this is illustrated in "the affair of the placards" in 1534 which directly challenged the king's authority and even security
These went on to attack the then tolerant majority in France -- again, just like the Moslems do now
in 1560, the H's were the ones who started the first destruction of ancient Churches -- note the first salvo was started by the Huguenots
Now, 40 years after the first confrontation by the Huguenots the St. Bart's massacre occurs -- 40 years after the country had been infiltrated by these people and who 25 years after the affair of the placards had started attacking Churches
these Huguenots then played the political game supporting the old enemy -- the English against France
They acted then just as the Moslems in France are acting now.
The Huguenots didn’t “infiltrate” France. They were French, Français de souche who were enlightened by the Reformation. Read a good history of the Reformation, then come back, minus your anti-Protestant bias and ignorance.