World War I began as a clash of 20th-century technology and 19th-century tactics, with the inevitably large ensuing casualties. By the end of 1917, however, the major armies, now numbering millions of men, had modernised and were making use of telephone, wireless communication, armoured cars, tanks, and aircraft. Infantry formations were reorganised, so that 100-man companies were no longer the main unit of manoeuvre; instead, squads of 10 or so men, under the command of a junior NCO, were favoured. Artillery also underwent a revolution. In 1914, cannons were positioned in the front line and fired directly at their targets. By 1917, indirect fire with guns  was commonplace, using new techniques for spotting and ranging, notably aircraft and the often overlooked field telephone. Counter-battery missions became commonplace, also, and sound detection was used to locate enemy batteries.

How many years passed from the revolution in 1914 to when indirect fire with guns became commonplace?
A: 3

Coming off their divisional home win over the Bengals, head coach John Harbaugh and the Ravens stayed at home for a Week 12 interconference duel with the San Francisco 49ers and their head coach (John's brother) Jim Harbaugh, on Thanksgiving. (The game was jokingly nicknamed "The Harbaugh Bowl.") Baltimore delivered the game's opening punch in the first quarter with a 39-yard field goal from kicker Billy Cundiff, but the 49ers answered with kicker David Akers getting a 45-yard field goal.  The Ravens regained the lead in the second quarter with a 23-yard field goal from Cundiff. San Francisco began the third quarter with Akers nailing a 52-yard field goal, yet Baltimore regained the lead in the fourth quarter with quarterback Joe Flacco finding tight end Dennis Pitta on an 8-yard touchdown pass, followed by a 39-yard field goal from Cundiff.  Afterwards, the defense would hold to prevent any comeback attempt from the 49ers. Linebacker Terrell Suggs (3 tackles, 3 sacks, & 1 forced fumble) was named NFL Network's Puddin' Pie Award winner.

How many more field goals did Billy Cundiff make compared to David Akers?
A: 1

Buffalo struck first late in the first quarter when Willis McGahee broke through a hole and ran 57 yards to the end zone. Justin Miller put the Jets in good field position with the ensuing kickoff return, and after Chad Pennington found Laveranues Coles on a long completion, he found him on a 10-yard pass for a touchdown, knotting the game at 7. On the next drive, Anthony Thomas fumbled for Buffalo and Miller recovered. Mike Nugent would knock in a 30-yard field goal to give the Jets the lead. With 4:59 left in the half, J. P. Losman found Lee Evans on a deep pass downfield that went for a 77-yard touchdown. On the first play after the two-minute warning, Pennington was intercepted by Nate Clements, who returned it 42 yards for a score. Nugent would add a 38-yard field goal right before halftime, and the Jets trailed 21-13 at halftime. The defenses held firm for a majority of the third quarter, before Losman found Robert Royal on a 6-yard touchdown pass. Rian Lindell's 34-yard field goal with 8:04 remaining capped the scoring.

How many touchdowns were scored in the first half of the game?
A:
4