Slack's were not Indians. They were Dutch. George Huddleston married Susan Slack, whoses father was in the Revolutionary War,
On Ancestry.com check the Joel Gibson family tree.beloging to Debbie Gibson. Joel's 7th great(I think)grandaughter Debbie's mother is a Bailey, follow the Bailey line until it ties in with the Huddleston line. The Huddleston line until it ties in with the Slack line. Follow the Slack line back on the tree-all the info. you want.