Question: What massacre was Peter Gusenberg's brother a victim of?

<P0-S0> Joseph Horn Cloud born 1873 and died September 18, 1920. <P0-S1>  His father was Horn Cloud and mother Nest, both parents died at the Wounded Knee Massacre along with two brothers William Horn Cloud (1876-1890), Sherman Horn Cloud (1865-1890) and a niece. <P0-S2>  Joseph was a survivor of the massacre as well as his brother Daniel and half brother Dewey Beard [p. 89-95]. <P0-S3>  Dewey's mother was Yellow Leaf who also died during the massacre. <P0-S4>  In the early 1900s a writer named Eli S. Ricker began research for a book he was going to call "The Final Conflict between the Red Men and the Palefaces." <P0-S5>  He gathered sources and interviews about conditions and battles on the Plains during the last half of the 1800s. <P0-S6>  He recorded the interviews in small note pads known to historians as the "Ricker Tablets." <P0-S7>  One such interview was with Joseph telling Ricker what he witnessed at the Wounded Knee Massacre, "When the shooting began the women ran to the ravine. <P0-S8>  The shooting was in every direction. <P0-S9>  Soldiers shot into one another... Many of the Indians in the circle were killed. <P0-S10>  Many of them mingled with the soldiers behind them, picking up guns from dead soldiers and taking cartridge belts." <SEP> <P1-S0> Frank Gusenberg (October 11, 1893 – February 14, 1929) was a German-American contract killer and a victim of the Saint Valentine's Day massacre in Chicago, Illinois. <SEP> <P2-S0>  A number of settlers from Low Dutch Station joined Colonel George Rogers Clark's militia after the massacre. <P2-S1>  The settlers were traveling southeast from Low Dutch Station to Harrod's Town. <P2-S2>  The area immediately east of Low Dutch Station had been overrun with British allied Indians. <P2-S3>  Ten of the seventeen settlers killed were members of the Westervelt family. <P2-S4>  The Westervelt Massacre had a chilling effect on the region. <P2-S5>  The caravan was ambushed in a surprise attack, during the night, after a day's travel of twelve miles. <P2-S6>  It remains one of the largest massacres in Kentucky state history. <P2-S7>  However, it is likely to have occurred at Floyd's Fork and Broad Run. <P2-S8> The Westervelt massacre, also known as the Westerfield massacre, was an indigenous attack on a caravan of Dutch frontier settlers that occurred during the American Revolutionary War around 3:00 am on June 27, 1780 in Kentucky County, Virginia, the present day state of Kentucky. <P2-S9>  The victims included men, women, and children. <P2-S10>  The Indians responsible for the massacre were allied to the British and received ₤5 for each victim's scalp cut off and returned to the British authorities. <P2-S11>  The exact location of the massacre is not definitively known. <P2-S12>  The settler relocation was in part a reaction to British Captain Henry Bird's invasion of Kentucky. <P2-S13>  The caravan was formed by Jacobus Westervelt and consisted of forty-one settlers from ten different families. <P2-S14>  Harrod's Town was fortified and a move south would lead the settlers away from Captain Bird's invading army from the north. <SEP> <P3-S0> Peter Gusenberg a.k.a. ""Goosey"" (September 22, 1888 – February 14, 1929) and his brother Frank were German-American contract killers and members of Chicago's North Side Gang, the main rival to the Chicago Outfit. <P3-S1>  Peter Gusenberg participated in an infamous attack on Al Capone during a vicious gang war.