By John Siddle An Army recruitment drive using video game Fortnite that had to be scrapped after an angry backlash cost £100,000. Top brass commissioned a YouTube promo to advertise an “exclusive” livestream on the battle simulator – which has a 12-plus age rating and is a hit with teens – featuring Army characters. They also spent cash signing up influencers including Yung Filly and Talia Mar to get Fortnite fans to tune in for an “Operation: Belong” event. But defence bosses pulled the campaign amid claims it targeted underage potential recruits. Social media user Derek Watson said: “Attempt…