CREATE TABLE table_203_587 (id NUMBER, "country" CLOB, "weapon designation" CLOB, "weapon description" CLOB, "year ( s )  delivered" CLOB, "quantity delivered" NUMBER)

which country had the largest number of towed guns delivered ?
SELECT "country" FROM table_203_587 GROUP BY "country" ORDER BY SUM("quantity delivered") DESC LIMIT 1
SELECT "country" FROM "table_203_587" GROUP BY "country" ORDER BY SUM("quantity delivered") DESC FETCH FIRST 1 ROWS ONLY