CREATE TABLE table_4157 ("Regiment" TEXT, "Company" TEXT, "Company Commander" TEXT, "Date of Election/Commission" TEXT, "County" TEXT)

What are the counties who company commander is Captain James R. Jackson and whose election of commission date is April 29, 1861?
SELECT "County" FROM table_4157 WHERE "Date of Election/Commission" = 'April 29, 1861' AND "Company Commander" = 'Captain James R. Jackson'
SELECT "County" FROM "table_4157" WHERE "Company Commander" = 'Captain James R. Jackson' AND "Date of Election/Commission" = 'April 29, 1861'