What is the number of wounded figures associated with a complement of 22 off 637 men?
CREATE TABLE "table1_2596811_12" (
  "unit" text,
  "commander" text,
  "complement" text,
  "killed" text,
  "wounded" text,
  "missing" text
);
SELECT COUNT("wounded") FROM "table1_2596811_12" WHERE "complement"='22 off 637 men';