 The ship mounted four 45 @-@ calibre 4 @.@ 7 @-@ inch ( 120 mm ) Mark IX guns in single mounts . For anti @-@ aircraft defence Hostile had two quadruple Mark I mounts for the 0 @.@ 5 inch Vickers Mark III machine gun . She was fitted with two above @-@ water quadruple torpedo tube mounts for 21 @-@ inch ( 533 mm ) torpedoes . One depth charge rail and two throwers were fitted ; 20 depth charges were originally carried , but this increased to 35 shortly after the war began . 
 The ship mounted four 45 @-@ calibre 4 @.@ 7 @-@ inch ( 120 mm ) Mark IX guns in single mounts . For anti @-@ aircraft defence Hostile had two quadruple Mark I <a href='uninflect' title='1'><mark>mounts</mark></a> for the 0 @.@ 5 inch Vickers Mark III machine gun . She was fitted with two above @-@ water quadruple torpedo tube mounts for 21 @-@ inch ( 533 mm ) torpedoes . One depth charge rail and two throwers <a href='uninflect' title='2'><mark>were</mark></a> fitted ; 20 depth charges <a href='uninflect' title='3'><mark>were</mark></a> originally carried , but this increased to 35 shortly after the war began . 
The ship mounted four 45 @-@ calibre 4 @.@ 7 @-@ inch ( 120 mm ) Mark IX guns in single mounts . For anti @-@ aircraft defence Hostile had 2 quadruple Mark I mount fir the 0 @.@ 5 inch Vickers Mark III machine gun . She was fitted with tw2bove @-@ water quadruple torpedo tube mounts for 21 @-@ inch ( 533 mm ) torpedoes . One depth charge rail and two 2owers was fitted ; 20 depth charges was originally carried , but this increased to 35 shortly after the war began .