This was, the unexpected summons of Fritz from her side, to battle with the legions of Germany against the threatened invasion of "the Fatherland" by France.
At the time, it looked sudden enough.

A little cloud, no bigger than a man's hand, had arisen on the horizon of European politics, which, each moment, grew blacker and more portentous; and, in a brief while, it burst into a war that deluged the vine-clad slopes of Rhineland and the fair plains of Lorraine with blood and fire, making havoc everywhere.
Now, however, looking back on all the events of that terrible struggle and duly weighing the surroundings and impelling forces leading up to it, allowing also for all temporary excuses and pretexts, and admitting all that can be said for partisanship on either side, there can be no use in blinking at the pregnant fact that the real cause of the war arose from a desire to settle whether the French or the Germans were the strongest in sheer brute force--just in the same way as two men, or boys, fight with nature's weapons in a pugilistic encounter to strive for the mastery, thus indulging in passions which they share with the beasts of the field! The long, steady, complete preparation for war on each side shows that this very simple and intelligible motive was at the bottom of it all; and it is pitiable to think, for the sake of human nature, when recapitulating the history of this fearful conflict of fifteen years ago which caused such misery and murderous loss of life, that two of the most polished, advanced, educated, and representative nations of Europe at that time should not have apparently attained a higher code of civilised morality than that adopted by the natives of Dahomey--one, ruled over by the blood-stained fetish of human sacrifice! As the world advances, looking at the matter in this light, we seem to have exchanged one sort of barbarism for another, and the present one appears almost the worse of the two, by the very reason of its being mixed up with so much scientific advancement, cultural refinement, and the higher development of man.

It is like the old devil returning and bringing with him seven other devils more powerful for evil than their original prototype, this prostitution of learning, intellect, and philosophy to the most debasing influences of human nature! These thoughts, however, did not affect either Fritz or his mother at the time.
Not being the only son of a widow, in which case he might have been exempted from service, Fritz, when he had reached his eighteenth year, had been compelled to join the ranks of the national army; and, after completing the ordinary course of drill, had been relegated to the Landwehr and allowed to return home to his civic occupation.

But, when the order was promulgated throughout the German empire to mobilise the vast human man-slaying machine which General Moltke and Prince Bismark had constructed with such painstaking care that units could be multiplied into tens, and tens into hundreds, and hundred into thousands--swelling into a gigantic host of armed men almost at a moment's notice, ready either to guard the frontier from invasion, or to hurl its resistless battalions on the hated foe whose defeat had been such a long-cherished dream--the young clerk received peremptory orders to join the headquarters of the regiment to which he was attached.

The very place and hour at which he was to report himself to his commanding officer were named in the general order forwarded along with his railway pass, so comprehensive were the details of the Prussian military organisation.