When the pilot became aware of who Penshurst was he landed, and agreed to spot for her while she dropped depth charges. However, on take-off the seaplane went out of control and crashed into the sea. As Penshurst stopped to pick up the crew, the U-boat, thinking it was safe, came to the surface again to attack. Taking the opportunity, Grenfell waited until the U-boat drew nearer, then opened fire. UB-19 was fatally damaged and sank. Grenfell was awarded the Distinguised Service Order (DSO) for this achievement. On 14 January Penshurst was able to repeat her success. Two months later she was on patrol in the Channel when she encountered a U-boat, . The U-boat closed in, opening fire at 3,000 yards. Grenfell sent off his panic party, and allowed Penshurst to turn as she slowed, to be broadside-on to the U-boat. However, the U-boat made to cross Penshursts bow, continuing to fire, causing damage and several casualties over a twenty-minute period. At length, when no further advantage could be gained, Penshurst opened fire, and scored several hits with her first shots. UB-37 was crippled and started to sink, and Penshurst finished her attack by dropping depth charges over the site. UB-37 was destroyed, with no survivors. On 20 February Penshurst again encountered a U-boat in the Southwest Approaches. She was again attacked, and after the U-boat closed was able to fire on her, causing damage. The U-boat submerged and was depth charged, but on this occasion was able to escape, returning to base despite the damage. Two days later on 22 February Penshurst again met with a U-boat, , which had just sunk the sailing ship Invercauld. As Penshurst drew up to pick up Invercaulds survivors, U-84 fired a torpedo at her, which was narrowly avoided. Penshurst then feigned running, but at half speed, and, as the U-boat opened fire, sent off her boat party. U-84 submerged to examine Penshurst in safety, but was satisfied, surfacing away. Penshurst was then able to open fire, damaging the U-boat, and dropping depth charges as she submerged. As she did this, Penshurst was joined by the sloop , which joined the attack. However, U-84 was able to surface, away from the two hunters, and fled on the surface, outstripping her two pursuers. The following month, on 30 March, Penshurst again encountered a U-boat, , but on this occasion the U-boat was able