CREATE TABLE table_4156 ("Regiment" TEXT, "Company" TEXT, "Company Commander" TEXT, "Date of Election/Commission" TEXT, "County" TEXT)

How many company commanders were commissioned or elected on November 12, 1861?
SELECT COUNT("Company Commander") FROM table_4156 WHERE "Date of Election/Commission" = 'November 12, 1861'
SELECT COUNT("Company Commander") FROM "table_4156" WHERE "Date of Election/Commission" = 'November 12, 1861'