So let's see what Great Lincoln did. He went from this:
......... So far as possible, the people everywhere shall have that sense of perfect security which is most favorable to calm thought and reflection. The course here indicated will be followed, unless current events and experience shall show a modification or change to be proper; and in every case and exigency my best discretion will be exercised according to circumstances actually existing, and with a view and a hope of a peaceful solution of the national troubles, and the restoration of fraternal sympathies and affections."To this:........... 'hold, occupy, and possess the property and places belonging to the Government'
in a grand total of 30 days. What happened to cause him to change his peaceful policy?
What happened to cause him to change his peaceful policy? The two passages you mention were separated by 135 words, not 30 days. They were part of the same pledge, that the government would continue in its duties and not press the issue in the hopes that a peaceful resolution could be found. The policy changed, of course, when the confederate army fired on Sumter.