The settlers saw the right to take possession of western lands and use them as they saw fitting as an essential element of American freedom. Settlers paid no attention to Indian land titles and admonished the government to set a low price on public land or give it away and regularly occupied land to which they had no legal title. Numerous settlers are also concerned unregulated population of lands west of Appalachian Mountains would aggravate constant warfare with Indians and viewed frontier settlers as disorganized and lacking reverence for authority.
Primary sources help us learn about people in the past because you are learning about events that occurred from people that were there to actually witness it. You get first-hand information passed to you whether it's via your grandparents, a journal, or a letter. From primary sources you can also learn about the ways people lives were. You are informed about their culture, religion, foods, and clothing. Differing from secondary sources, you are not reading or listening to information about the past, or even present, that is biased and has edited or opinionated information included.
I know that Salem Poor fought at Bunker Hill and I think he fought at Saratoga as well.