CREATE TABLE table_7070 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "Record" CLOB)

What was the earliest week the Titans played at Ford Field?
SELECT MIN("Week") FROM table_7070 WHERE "Game site" = 'ford field'
SELECT MIN("Week") FROM "table_7070" WHERE "Game site" = 'ford field'