Battlefield 1 has only 5 singleplayer episodes
According to DICE, there will be 5 different “War Stories” to choose from in Battlefield 1 singleplayer campaign. They are designed to encompass different theaters of WWI, like the Arabian theater (recall the Lawrence of Arabia) or the European theatre. The details of the 5 playable War Stories have been specified by DICE. The fact that they are named “War Stories” instead of plain, old missions probably lies in the fact that there are only 5 of them, which might cause an uproar in a large portion of Battlefield community.