The Gorgie side were top of the old First Division in November of that year when 13 players enlisted in 'McCrae's Battalion' to fight in France.
By the time the conflict was over, seven players had died and while there is a long-standing Heart of Midlothian War Memorial at Haymarket in Edinburgh, today a plaque on the main stand at the club's ground was unveiled.
Afterwards, Locke told Hearts TV: "The plaque here is long overdue.
"This was definitely the greatest team that Hearts ever had and it is important that we remember them.
"These guys made the ultimate sacrifice in as much as that they put their lives on the line for the country and you can never better that.
"It is really important for the younger players, even though a lot of them are Hearts supporters and they know about McCrae's battalion and the history of the club.
"I think that's what makes this club really special.
"It is more than a football club to all of us, it is not just a normal club, it has great history, great tradition and it is important that we remember the 1914 team."
Turning to matters on the field, the Jambos boss looked forward to the visit of Dundee United in the Scottish Premiership on Saturday, hoping that Wednesday night's penalty shoot-out over Queen of the South in the Scottish League Cup third-round at Tynecastle will bring with it a return to league form.
The Jambos have not picked up points in any of their last three SPFL games but Locke is hoping for a revival against the Tannadice side, whom he watched draw 2-2 with Motherwell last Sunday.
"I went up to the game last Sunday and they had David Goodwillie on the bench and that tells you the quality that they have," said the former Hearts skipper.
"So it will be a really difficult game.
"Jackie McNamara has them well-organised, they are playing some great stuff and they have a lot of movement up front so we will have to be on our toes.
"It was great to get through to the next round of the cup the other night and hopefully that will give us confidence to get back on track in the league.
"I can see a spring in the step of the players, it's great to get back to winning ways and with a huge Hearts support behind us tomorrow, I'm sure that will be the difference."