O! Say Can You See. In this post, we will see more from our tour of the Star-Spangled Banner Flag House in Baltimore. Flag maker Mary Pickersgill and a team of eight other women, including indentured servants, took just six weeks to sew the mammoth flag that survived the bombardment of Fort McHenry during the War of 1812, inspiring attorney Francis Scott Key to pen a poem that would become our national anthem.