CREATE TABLE table_55491 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the smallest crowd at a home game for essendon?
SELECT MIN("Crowd") FROM table_55491 WHERE "Home team" = 'essendon'
SELECT MIN("Crowd") FROM "table_55491" WHERE "Home team" = 'essendon'