Rubuta ci gaba don wannan sakin layi - A cikin 1799, bayan ya shafe hunturu a makarantar ma'adinai a Freiberg, Aall ya koma Norway. Bayan rasuwar mahaifinsa, ya saka dukiyarsa a cikin sayen babbar masana'antar ƙarfe ta Nes a yankin ma'adinan Arendal. Bayan sayen kayan aikin ƙarfe, aikin ya zama mafi inganci, amma an sanya shi cikin mawuyacin hali a farkon yaƙe-yaƙe na Turanci
a shekara ta 1801. Duk da haka, kasuwancin ya ci gaba.