An alternative perspective was advanced in 2016 by Robert Forczyk in "We march against England". Forczyk claims to apply a much more realistic assessment of the relative strengths and weaknesses of both German and British forces, and challenges the views advanced by previous writers that the Royal Navy might easily have overwhelmed the German naval units protecting the first wave invasion fleet. His assessment concurs with that emerging from the 1974 Sandhurst Sea Lion wargame (see below) that the first wave would likely have crossed the Channel and established a lodgement around the landing beaches in Kent and East Sussex without major loss, and that the defending British forces would have been unlikely to have dislodged them once ashore. He proposes though, that the westernmost German landing at beach 'E' could not have been sustained for long against counterattacking British ground, naval and air forces, and that accordingly these German units would have had to fight their way eastwards, abandoning any aspiration to hold Newhaven. In the absence of access to a major port and with continued losses of German troop transport vessels from submarine attack, Forczyk argues that proposed arrangements for landing the second wave onto the beaches would have been wholly impractical once autumn and winter weather set into the Channel, so the first wave would be stranded in Kent as a 'beached whale' without substantial armour, transport or heavy artillery — unable to break out and threaten London. Nevertheless, Forczyk does not accept that they would have surrendered, pointing to the determined resistance of surrounded German forces at Stalingrad and Demyansk. He suggests they could have held on into 1941, sustained by a small-ship fast night-time resupply operation into Folkestone (and maybe Dover), holding the possibility of negotiating their withdrawal in Spring 1941 under a truce agreed with the British government.