campaigns   to  unite   Arabia’s    tribes  under   the banner  of
Islam.   These   were    full-scale  expeditions     lasting     weeks
and even    months  at  a   time,   and he  usually took    at  least
one of  his wives   along   with    him.    None    was more    eager
to  go  than    Aisha.
For a   spirited    city    teenager,   this    was pure    excitement.
If  Medina  was not yet a   city    in  the way we  now think   of
the  word—it     was     more    of  an  agglomeration   of  tribal
villages,    each    one     clustered   around  a   fortiɹed    manor
house—it    was urban   enough  for the nomadic past    to
have     become  a   matter  of  nostalgia.  Long    poems
celebrated   the     purity  of  the     desert,     softening   its
harshness   with    the idea    of  a   spiritual   nobility    lost    in  the
relative    ease    of  settled life.
For  Aisha,  then,   these   expeditions     were    romance.
There   was the thrill  of  riding  out of  the ribbon  of  green
that     was     Medina,     up  into    the     jagged  starkness   of  the
mountains    that    rose    like    a   forbidding  no-go   zone
between  Medina  and     the     vast    deserts     of  central     and
northern     Arabia.     The     Hijaz,  they    called  it—the
“barrier”—and    beyond  it  stretched   more    than    seven
hundred  miles   of  arid    steppe  until   the     land    suddenly
dipped  into    the lush    river   basin   of  the place   they    knew    as
al-Iraq,    from    the Persian word    for lowlands.
This    was Aisha’s chance  to  discover    the fabled  purity
of  the desert, and she must    have    savored every   detail  of
it,  admiring    the     way     the     scouts  who     led     them    knew
